• The enhancements to Firefox provide the best possible browsing experience on the Web. The new Firefox smart location bar, affectionately known as the "Awesome Bar," learns as people use it, adapting to user preferences and offering better fitting matches over time.

• Firefox is built on top of the powerful new Gecko platform, resulting in a safer, easier to use and more personal product.

• Firefox raises the bar for security. The new malware and phishing protection helps protect from viruses, worms, trojans and spyware to keep people safe on the Web.

• Everyone uses the Web differently, and Firefox lets users customize their browser with more than 5,000 add-ons.
•  

new

• • Roar for moar protection against harmful downloads! We've got your back
  • Process separation (e10s) is enabled for some of you. Like it? Let us know and we'll roll it out to more.
  • Add-ons that have not been verified and signed by Mozilla will not load
  • GNU/Linux fans: Get better Canvas performance with speedy Skia support. Try saying that three times fast
  • WebRTC embetterments:
    • Delay-agnostic AEC enabled
    • Full duplex for GNU/Linux enabled
    • ICE Restart & Update is supported
    • Cloning of MediaStream and MediaStreamTrack is now supported
  • Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know
  • Windows folks: Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode
  • The media parser has been redeveloped using the Rust programming language

fixed

• • Heyo, Jabra & Logitech C920 webcam users. We fixed those pesky WebRTC bugs causing frequency distortions. Buh-bye, squeaky voice!
  • Improved step debugging on last line of functions

changed

• • So long to support for 10.6, 10.7 and 10.8. Now we can focus on where most Mac users are: 10.9. Don't forget to upgrade!
  • After version 48, SSE2 CPU extensions are going to be required on Windows
  • Au revoir to Windows Remote Access Service modem Autodial

developer

• • WebExtensions support is now considered as stable
  • Want to move absolute & fixed positioned elements? (Who doesn't, right?) Now you can with our geometry editor.
  • The memory tool now has a tree map view for your debugging pleasure. It's a little bit of "boo" and a whole lot of "ya."
  • We're putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages
  • Content Security Policy (CSP) is now enforced for WebExtensions. (Who's down with CSP?)
  • Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure.
  • Add-on development just got easier because you can reload them from about:debugging — because we're all about debugging.
  • This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools.
  • Expand network requests from the console panel to view request details in line, so you can see things in context
  • Workers can now use the Web Crypto API

• 
  Reference: Release notes for Firefox 48.
  https://www.mozilla.org/en-US/firefox/48.0/releasenotes/

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